Analyzing the influence of different synthetic talcs in waterborne polyurethane nanocomposites obtainment

Abstract

Waterborne polyurethane (WPU) nanocomposites were produced utilizing synthetic talc in gel form in order to improve its physical-chemical properties. Synthetic talc manufactured in nano-gel form are interesting because their interaction with water occurs through hydrogen bonding favoring fillers dispersion within the WPU matrix. WPUs are environmental friendly materials because no organic solvents are used in its production. The nanocomposites obtained with the three synthetic talc nano-gel fillers presented a good dispersion even when higher amounts of fillers were added, as seen by X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, and atomic force microscopy analyses. The addition of synthetic talcs improved WPU nanocomposites mechanical properties. Storage and loss modulus results proved fillers incorporation into the WPU matrix corroborating with Fourier transform infrared spectroscopy results. Results demonstrated that synthetic talcs in nano-gel form are interesting to obtain WPU nanocomposites with superior mechanical properties.

The influence of Ni/Mg content of synthetic Mg/Ni talc on mechanical and thermal properties of waterborne polyurethane nanocomposites

“…This change in loss modulus and Tg values (WPU = 237 MPa at − 24 °C; WPU/ST100Ni 1% = 158 MPa at − 19 °C and WPU/ST100Ni 10% = 102 MPa at − 18 °C) could be related to the good incorporation and distribution of the fillers into WPU chains [64]. Higher values for storage modulus, loss modulus and Tg peak indicated strong adhesion of the fillers into the WPU matrix, as previously reported by our group [22]. All samples present cracks.…”

“…These results may be associated with the nanocomposite preparation method. Physical mixture method results in nanocomposites with more efficient synthetic talc/polymer interaction when compared to the in situ method [22,23]. The in situ method could facilitate the filler/matrix crosslink due to the chemical reaction [38,39].…”

“…Aiming to improve these properties the addition of nanofillers has been studied. Literature describes the incorporation of silica nanohybrids [12], TiO 2 [13], cellulose nanofilers [14], Fe 2 O 3 [15], Ni-Zn [16,17], SiO 2 [18], carbon nanofillers [19], clays and carbon nanotubes [20], Ni 0.3 Zn 0.5 Fe 2 O 4 nanoparticles [21], synthetic talc [22], ferrite nanoparticles [23][24][25], ZnO [24], graphite [26], graphene oxides [27], nanoclay [28,29] functionalized clays [30].…”

Polyurethane /Ionic Silica Xerogel Composites for CO2 Capture

“…Interactions between hydroxyl groups present in the filler structure and PU hard segments can generate a deleterious effect on PU composites thermal stability. This effect might lead to breaking urethane and urea bonds of hard segments 62,63 . PU and PU composites DSC thermograms are shown in Fig.…”

A review of Ni and Co incorporation during talc synthesis: Applications to crystal chemistry, industrial compounds and natural Ni- and Co-rich ore

“…Synthetic talc gel (Dias et al, 2018) and nano-Fe3O4-synthetic talc gel (Dos Santos et al, 2018) was also incorporated into a waterborne polyurethane (WPU) matrix, which is much more environmentally friendly than its solvent-based analogue. For example, in the case of nano-Fe3O4-synthetic talc gel, the obtained composite displayed a typical ferromagnetic behavior below Curie temperature (about 120 K), a superparamagnetic behavior above this temperature and superior mechanical properties compared to solvent-based nanocomposites.…”